<template>
  <div class='sub-sort'>
    <div class="sort">
      <a :class="{active:sortParams.sortField===null}" @click="changeSort(null)" href="javascript:;">默认排序</a>
      <a :class="{active:sortParams.sortField==='publishTime'}" @click="changeSort('publishTime')" href="javascript:;">最新商品</a>
      <a :class="{active:sortParams.sortField==='orderNum'}" @click="changeSort('orderNum')" href="javascript:;">最高人气</a>
      <a :class="{active:sortParams.sortField==='evaluateNum'}" @click="changeSort('evaluateNum')" href="javascript:;">评论最多</a>
      <a @click="changeSort('price')" href="javascript:;">
        价格排序
        <i class="arrow up" :class="{active:sortParams.sortField==='price' && sortParams.sortMethod==='asc' }"/>
        <i class="arrow down" :class="{active:sortParams.sortField==='price' && sortParams.sortMethod==='desc' }"/>
      </a>
    </div>
    <div class="check">
      <XtxCheckbox @change="changeCheck()" v-model="sortParams.inventory">仅显示有货商品</XtxCheckbox>
      <XtxCheckbox @change="changeCheck" v-model="sortParams.onlyDiscount">仅显示特惠商品</XtxCheckbox>
    </div>
  </div>
</template>
<script>
import { reactive } from 'vue-demi'
export default {
  name: 'SubSort',
  setup(props,{emit}){
    //实现交互(实现交互的数据和后台保持一致)
    const sortParams=reactive({
      inventory:false,
      onlyDiscount:false,
      sortField:null,//publishTime,orderNum,price,evaluateNum
      sortMethod:null//asc正序，desc为倒序，默认desc
    })
    //需要绑定按钮的点击事件修改排序字段和排序方式
    const changeSort=(sortField)=>{
      if(sortField==='price'){
        sortParams.sortField=sortField
        //处理排序
        if(sortParams.sortMethod===null){
          sortParams.sortMethod='desc'
        }
        else{
          sortParams.sortMethod=sortParams.sortMethod==='desc' ? 'asc' : 'desc'
        }
      }
      else{
        //如果已经选择，则阻止运行
        if(sortParams.sortField===sortField){return}
        sortParams.sortField=sortField
        sortParams.sortMethod===null
      }
      //触发sort-change事件
    emit('sort-change',sortParams)
    }
    const changeCheck=()=>{
      emit('sort-change',sortParams)
      }
    //提供模板使用
    return {sortParams,changeSort,changeCheck}
  }
}
</script>
<style scoped lang='less'>
.sub-sort {
  height: 80px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  .sort {
    display: flex;
    a {
      height: 30px;
      line-height: 28px;
      border: 1px solid #e4e4e4;
      padding: 0 20px;
      margin-right: 20px;
      color: #999;
      border-radius: 2px;
      position: relative;
      transition: all .3s;
      &.active {
        background: @xtxColor;
        border-color: @xtxColor;
        color: #fff;
      }
      .arrow {
        position: absolute;
        border: 5px solid transparent;
        right: 8px;
        &.up {
          top: 3px;
          border-bottom-color: #bbb;
            &.active {
            border-bottom-color: @xtxColor;
          }
        }
        &.down {
          top: 15px;
          border-top-color: #bbb;
          &.active {
            border-top-color: @xtxColor;
          }
        }
      }
    }
  }
  .check {
    .xtx-checkbox {
      margin-left: 20px;
      color: #999;
    }
  }
}
</style>
